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oe1(光电查) - 科学论文

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出版时间
  • 2019
研究主题
  • Dye-sensitized solar cell
  • Photoelectrode
  • Light scattering layer
  • Transmittance
  • White pigment (R902+)
  • Rutile titanium dioxide
应用领域
  • Optoelectronic Information Materials and Devices
机构单位
  • Tribhuvan University
352 条数据
?? 中文（中国） ▾

  • Zwitterion Effect of Cow Brain Protein towards Efficiency Improvement of Dye-Sensitized Solar Cell (DSSC)

    摘要： Dye-Sensitized Solar Cell (DSSC) constitutes a solar cell using natural dyes from plants that are adsorbed in semiconductors to convert solar energy into electrical energy. DSSC has relatively inexpensive fabrication costs, is easy to produce, works in visible light, and is environmentally friendly. The disadvantage of DSSC is that its e?ciency is still low compared to silicon solar cells. This low e?ciency is due to obstacles in the ?ow of electric current on DSSC. In this study, DSSC has been successfully fabricated with the deposition of clathrin protein from cow brain. The zwitterions e?ect of protein on cow brain is able to reduce resistance and increase electric current on DSSC. The zwitterions e?ect of cow brain protein that ?lls gaps or empty spaces between TiO2 particles generates acidic reactions (capturing electrons) and bases (releasing electrons); hence, proteins in the cow brain are able to function as electron bridges between TiO2 molecules and generate an increase in electric current in DSSC. The method used in this research was to deposit clathrin protein from cow brain in a porous TiO2 semiconductor with a concentration of 0%, 25%, 50%, and 75%. Tests carried out on DSSC that have been performed were X-Ray Di?ractometer (XRD) testing to determine the crystal structure formed, Fourier Transform Infrared Spectroscopy (FTIR) testing to determine the functional groups formed on DSSC, Scanning Electron Microscopy (SEM) testing to determine the surface morphological characteristics of the DSSC layer, and testing the e?ciency using AM 1.5 G solar simulator (1000 W/m2) to determine the e?ciency changes that occur in DSSC. From the XRD test results by increasing the concentration of cow brain protein in DSSC, the structure of amino acid crystals also increased and the crystal size increased with the largest crystal size of 42.25 nm at the addition of 75% of cow brain protein. FTIR test results show that the addition of cow brain protein will form functional protein-forming amino groups on DSSC. FTIR analysis shows the sharp absorption of energy by protein functional groups in the FTIR spectrum with increasing concentration of cow brain protein in DSSC. The SEM test results show that the concentration of additional molecules of protein deposited into TiO2 increases and the cavity or pore between the TiO2 molecules decreases. The reduction of cavities in the layers indicates that protein molecules ?ll cavities that exist between TiO2 molecules. From the results of testing using AM 1.5 G solar simulator (1000 W/m2), the highest e?ciency value is 1.465% with the addition of 75% brain protein concentration.

    关键词： DSSC,efficiency improvement,clathrin protein,zwitterions effect,TiO2,Dye-Sensitized Solar Cell,cow brain

    更新于2025-09-19 17:13:59

  • Photoexcitation Processes in Oligomethine Cyanine Dyes for Dye-Sensitized Solar Cellsa??Synthesis and Computational Study

    摘要： We report density functional theory (DFT) calculations of three newly synthesized oligomethine cyanine-based dyes as potential TiO2-sensitizers in dye-sensitized solar cells. The three dyes have π-symmetry and the same acceptor side, terminating in the carboxylic anchor, but they differ through the π-bridge and the donor groups. We perform DFT and time-dependent DFT studies and present the electronic structure and optical properties of the dyes alone as well as adsorbed to the TiO2 nanocluster, to provide some predictions on the photovoltaic performance of the system. We analyze theoretically the factors that can influence the short circuit current and the open circuit voltage of the dye-sensitized solar cells. We examine the matching of the absorption spectra of the dye and dye-nanocluster system with the solar irradiation spectrum. We display the energy level diagrams and discuss the alignment between the excited state of the dyes and the conduction band edge of the oxide as well as between the redox level of the electrolyte and the ground state of the dyes. We determine the electron density of the key molecular orbitals and analyze comparatively the electron transfer from the dye to the semiconducting substrate. To put our findings in the right perspective we compare the results of our calculations with those obtained for a coumarin-based dye used in fabricating and testing actual devices, for which experimental data regarding the photovoltaic performance are available.

    关键词： optical spectra,titanium dioxide cluster,dye-sensitized solar cells,oligomethine cyanine-based dyes,density functional theory

    更新于2025-09-19 17:13:59

  • Novel KFeO<sub>2</sub> nanoparticles for dye-sensitized solar cell

    摘要： Novel KFeO2 nanoparticles for dye-sensitized solar cell. Environmentally clean and green source of energy is solar energy that can meet the increasing demand for energy. Recent trends in solar energy reflect that delafossite materials getting more attention because of its low-cost production and easy method of synthesis, non-toxic nature, environment-friendly nature, degradability compared to the silicon. In this direction, delafossite KFeO2 nanoparticles have synthesized by chemical method and used as photo-anode material for dye-sensitized solar cells (DSSC). The structural, morphological, optical and photovoltaic properties of KFeO2 nanoparticles have been investigated. Transmission electron microscopy (TEM) study reveals that the KFeO2 nanoparticles exhibit spherical morphology with particle size 12 nm. Rietveld refinement of x-ray diffraction (XRD) patterns of KFeO2 reflects, its orthorhombic phase with Pbca space group. The optical study reveals that the bandgap of the KFeO2 nanoparticles lying in the visible range of spectrum, i.e., 1.88 eV. The DSSC has been fabricated using KFeO2 nanoparticles. The power conversion efficiency parameters is 0.84 V; 4.72 mA/cm2; 64% and 2.54% respectively, for open-circuit voltage (VOC), short circuit current–density (JSC), fill factor (FF) and Power conversion efficiency for fabricated DSSC. It has been found that the efficiency of fabricated DSSC has been decrease to 2.27% after 45 days.

    关键词： Dye sensitized solar energy materials,KFeO2,Sol-gel synthesis,Nanoparticles

    更新于2025-09-19 17:13:59

  • Synergistic enhancements in the performances of dye-sensitized solar cells by the scattering and plasmon resonance of Au-nanoparticle multi-shell hollow nanospheres

    摘要： Novel multi-shell hollow SiO2@Au@TiO2 (HSAT) nanospheres are synthesized by multi-step method. Composite photoanodes and Dye-sensitized solar cells (DSSCs) with different amount of HSAT nanospheres are studied. The study indicates that the HSAT nanospheres have enhanced the scattering and absorption of incident light in the photoanode, reduced the interface transmission resistance, increased the electron lifetime, and thus significantly improved performance of DSSCs. The maximal Jsc and photoelectric conversion efficiency (PCE) obtained in the optimal DSSC doped with HSAT of 3.0% are 15.83 mA cm?2 and 7.21%, greatly enhanced by 21.0% and 20.4%, respectively, compared with those of the pure TiO2-based DSSC. These remarkable enhancements in DSSCs performance can be attributed to the synergistic and complementary effects of the localized surface plasmon resonance and strong light scattering of HSAT nanospheres, which has significantly improved the absorption and utilization on incident light and thus the PCE of the DSSCs. Such synergistic and complementary effects of the different functions are also likely expected to play roles in the performance improvements in other solar cells.

    关键词： scattering enhancement,localized surface plasmon resonance,composite photoanodes,dye-sensitized solar cells,multi-shell hollow structure

    更新于2025-09-19 17:13:59

  • Grafted PEO polymeric ionic liquid nanocomposite electrospun membrane for efficient and stable dye sensitized solar cell

    摘要： An innovative polymeric ionic liquid (PIL) was synthesized by covalently grafting vinyl imidazolium iodide and methyl methacrylate onto poly (ethylene oxide) (PEO). Synthesised tungsten oxide nanoparticles (WO3NPs) were incorporated into the PIL solution and a polymer nanocomposite fibrous membrane (PVIM-W) was fabricated by electrospinning. This was used as a functional electrolyte for quasi solid state dye sensitized solar cell ((QSS-DSSC). The structure and morphology of the membranes and its physical characteristics as electrolytes were studied. The SEM images showed formation of uniform and beadless nanofibers. Photovoltaic and electrochemical effects of all the electrolytes have been examined. PVIM-W membrane exhibited superior power conversion efficiency (η) of 7.2% and better stability (up to 94.4% of its initial conversion efficiency after 500 h) when compared to the cell with the liquid electrolyte (η= 6.85%) and the ungrafted PEO membrane. This novel PVIM-W membrane based electrolyte shows great prospect for development of efficient and stable QSS-DSSC.

    关键词： polymeric ionic liquid,poly (ethylene oxide),Dye sensitized solar cell,electrolyte,electrospun membrane

    更新于2025-09-19 17:13:59

  • Improved photovoltaic performance of dye-sensitized solar cells by Au-ion implantation of titania film electrodes

    摘要： Plasmonic metal nanoparticles are known to work as light-harvesting antennae and to enhance photocurrents of photovoltaic cells. Therefore, in this work, the effect of gold (Au) ions distribution on the efficiency of dye sensitized solar cells (DSSCs) has been investigated. Thin films of TiO2 have been deposited on FTO glass substrates by the doctor tape method. Au ions were then implanted on these films with different fluence rates (i.e., 2 × 1014, 4 × 1014 and 6 × 1014 ions/cm2). XRD results confirmed that TiO2 is present in the anatase phase up to a 4 × 104 ions/cm2 fluence rate. At a 6 × 1014 ions/cm2 fluence rate, one peak of rutile is obtained which confirmed that the film has mixed phases of TiO2. UV results show that dye is adsorbed into all photoanodes. Maximum dye absorption is seen at a fluence rate of 4 × 1014 ions/cm2. The energy conversion efficiency of DSSC is highly dependent on the fluence rate of Au. At a fluence rate of 4 × 1014 ions/cm2, the cell has a high short circuit current density (JSC) of 7.21 mA/cm2, resulting in a high efficiency (×) of 2.92%. Impedance spectroscopy shows that the cell formed by Au ions fluence rate of 4 × 1014 ions/cm2 has a low recombination rate of electron/hole pairs.

    关键词： Impedance spectroscopy,Ions implantation,Au,TiO2,Dye-sensitized solar cells

    更新于2025-09-19 17:13:59

  • Reverse micelle facilitated synthesis of nanostructured polyaniline as the counter electrode materials in dye-sensitized solar cells

    摘要： We report a reverse-micelle emulsion polymerization of nanostructured PANI using a nonionic surfactant Polyglyceryl-2-Dipolyhydroxystearate (PGPH) at various concentrations from 2% to 6% (v/v). SEM images show that the obtained morphologies are irregular agglomerates at low PGPH concentration and relatively regular granules at high PGPH concentration. FTIR and Raman spectra show that the synthesized PANI is in the form of Emeraldine salt (PANI ES) with electrical conductivity around 10?3 S cm?1. Photovoltaic current-voltage (J-V) measurements show the highest power conversion efficiency is achieved at 1.71% at 6% (v/v) of PGPH.

    关键词： dye-sensitized solar cell,Counter-electrode materials,nanostructured polyaniline,emulsion polymerization,reverse micelle,polyglyceryl-2-dipolyhydroxystearate

    更新于2025-09-19 17:13:59

  • Fusing Thienyl with N-Annulated Perylene Dyes and Photovoltaic Parameters for Dye-Sensitized Solar Cells

    摘要： Due to the role of dye in dye-sensitized solar cells (DSSCs), design novel dye sensitizer is effective strategy to improve power conversion efficiency. To this end, the fundamental issue is the understanding sensitizer’s trilateral relationship among molecular structure, optoelectronic properties and photovoltaic performance. Here, on the one hand, to investigate the relationship between molecular structure and properties, considering the good performance of N-annulated perlyene dye sensitizers, the geometries, electronic structures and excitations of the selected representative organic dye sensitizers C276, C277, C278 and the dyes adsorbed on TiO2 clusters were calculated. It is found that, fusing thienyl to N-annulated perlyene can elevate the highest occupied molecular orbital (HOMO) energies, reduce orbital energy gap, increase density of states, expand HOMO to benzothiadiazole moiety, enhance charge transfer excitation, elongate fluorescence lifetime, amplify light harvesting efficiency and induce red-shift of absorption spectra. The transition configurations and molecular orbitals of dye adsorbed systems support that the electron injection in DSSCs based on these dyes are fast mode. On the other hand, to exposure the relationship between properties and performance, based upon extensive analysis of electronic structures and excitation properties of these dye sensitizers and the dye adsorbed systems, we present new quantities as open-circuit voltage and short-circuit current density descriptors, which celebrate the quantitative bridge between the photovoltaic parameters and the electronic structure related properties. The results of this work are critical for design novel dye sensitizers for solar cells.

    关键词： electronic structures,N-annulated perylene dyes,photovoltaic parameters,dye-sensitized solar cells,excitation properties

    更新于2025-09-19 17:13:59

  • Rational Design of Phenothiazine-Based Organic Dyes for Dye-Sensitized Solar Cells: The Influence of ??-Spacers and Intermolecular Aggregation on Their Photovoltaic Performances

    摘要： Power conversion efficiency (PCE) is one of the important factors in influencing the overall performance of dye-sensitized solar cells (DSSCs), and precise prediction of PCE is a feasible strategy for preparing highly-efficient DSSCs devices. In this work, we designed a series of phenothiazine-based organic dyes by introducing different π-spacers including the 4-isopropyl-4H-dithieno[3,2-b:2′,3′-d]pyrrole (DTP) and 2,7-dihydronaphtho[1,2-d:5,6-d']diimidazole (NDI) to tune their photovoltaic properties. The present studies reveal that the PCE value of the DTP-based dye is estimated to 8.55%, in excellent agreement with the experimentally available value (8.19%) observed in the reported analogue. In comparison to DTP, the strong electron-deficiency NDI group induces a remarkable red-shifting of maximum absorption band, broadening the optical absorption into the near-infrared region. As a consequence, the NDI-based dye achieves an impressive PCE value of 15.51%, which is expected to be a potential organic dye applied in DSSCs.

    关键词： Intermolecular aggregation,Phenothiazine-based organic dyes,π-spacers,Photovoltaic performances,Dye-sensitized solar cells

    更新于2025-09-19 17:13:59

  • Efficiency Enhancement of Dye-Sensitized Solar Cells Using Tia??Nb Alloy Photoanodes with Mesoporous Oxide Surface

    摘要： A native mesoporous titanium-niobium oxides layer on a Ti-6wt%Nb alloy sheet surface prepared through H2O2 pretreatment was successfully developed as an ef?cient photoanode for a dye-sensitized cell (DCCS). This alloyed mesoporous structure not only provided an increased surface area in contact with screen-printed TiO2 nanoparticles but also enabled Nb alloying in sintered nanoparticle deposits. Improvement of energy conversion ef?ciency of DSSCs can be increased up to 22% using H2O2 pretreatments with a proper post-annealing, and the mesoporous Ti–Nb photoanodes enhanced conversion ef?ciency by 15.2% to 18.3%, compared with unalloyed structures. EIS results under dark current indicate that DSSCs with mesoporous Ti–Nb photoanode exhibited a greater inhibition of recombination of electrons and holes at the interfaces of Nb-doped TiO2/dye/electrolyte layer due to energy barriers.

    关键词： Efficiency enhancement,Mesoporous oxide surface,Ti–Nb alloy,Photoanodes,Dye-sensitized solar cells

    更新于2025-09-19 17:13:59